#!/bin/bash -eu
# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

fuzzer=coverage_atheris_fuzzer.py
fuzzer_basename=$(basename -s .py $fuzzer)
fuzzer_package=${fuzzer_basename}.pkg

# To avoid issues with Python version conflicts, or changes in environment
# over time on the OSS-Fuzz bots, we use pyinstaller to create a standalone
# package. Though not necessarily required for reproducing issues, this is
# required to keep fuzzers working properly in OSS-Fuzz.
pyinstaller --distpath $OUT --onefile --name $fuzzer_package $fuzzer

# Create execution wrapper. Atheris requires that certain libraries are
# preloaded, so this is also done here to ensure compatibility and simplify
# test case reproduction. Since this helper script is what OSS-Fuzz will
# actually execute, it is also always required.
# NOTE: If you are fuzzing python-only code and do not have native C/C++
# extensions, then remove the LD_PRELOAD line below as preloading sanitizer
# library is not required and can lead to unexpected startup crashes.
echo "#!/bin/sh
# LLVMFuzzerTestOneInput for fuzzer detection.
this_dir=\$(dirname \"\$0\")
LD_PRELOAD=\$this_dir/sanitizer_with_fuzzer.so \
  ASAN_OPTIONS=\$ASAN_OPTIONS:symbolize=1:external_symbolizer_path=\$this_dir/llvm-symbolizer:detect_leaks=0 \
  \$this_dir/$fuzzer_package \$@" > $OUT/$fuzzer_basename
chmod +x $OUT/$fuzzer_basename